抄録
Numerical simulation of distant tsunamis traveling through the sea on the plate or over the mantle has been performed, where it is assumed that the upper layer of mantle under the crust is a fluid, while the plate is an elastic thin plate floating between the sea and mantle. Internal-mode tsunamis progressing more slowly than the surface-mode ones appear because of the existence of the mantle, i.e., the lower layer of fluids. In several cases, where the parameters are the density and static depth of the upper layer of mantle, as well as the flexural rigidity of plate, the internal-mode tsunamis show an appropriate time lag of peak time from that of tsunamis propagating through the sea without the mantle, after the travel between Chile and Japan.
